What shipped
Unity says the plugin includes first-party skills written by Unity teams plus the Unity CLI workflow. Unity's discussion post says the initial package covers 31 skills and targets Unity 6+.
Important limitation
Unity explicitly describes this as a skills package rather than an MCP server. Treat it as authoritative task guidance and CLI workflow support, not as magic unrestricted control of every running Editor state.
Best first use: boring repeatable setup
Use agent assistance for package setup, localization, UI, navigation, physics and other documented workflows, then run a separate project preflight before shipping or handing assets to somebody else.
Do not remove QA from the loop
Generated changes still need project-specific verification: missing scripts, broken materials, texture budgets, hierarchy/prefab assumptions and platform constraints do not disappear because an agent produced the change.
Official references
Unity official Codex plugin announcement · Unity discussion / skill details